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If you're tired of hunting endlessly for appropriate sized fuel line copper crush washers in the local auto parts stores, or remembering to order them ahead of time whenever doing maintenance work, and paying a buck or two per washer each time, I found a great alternative.
Ignore the Stainless Steel in the title. They are indeed copper as pictured. For under $2 shipped for 20 units, I figured it was worth a shot. Not all M10's are the right size, with variations in inner and/or outer (less significant) diameter and thickness. That listing had the perfect measurements, though, and they ended up being an exact match for one of my old factory washers.
It's worth ordering now and having a big bag of spares on hand when they arrive in a month. I'll probably never need them now that I have them...